On 08/10/2020 14:51, Fredxx wrote:
On 07/10/2020 21:14:23, bert wrote:
Is there by any chance a simple rule of thumb for calculating the
required size of a replacement o ring? I l looked up a supplier and
they had a chart which seemed horribly complicated.

There may well be charts but I have gone by diameter and thickness as
being the two defining measurements.
Â* https://en.wikipedia.org/wiki/O-ring

https://www.theoringstore.com/store/...d=41&chapter=6

Correct, two dimensions and the material are the only parameters. OD
follows from ID and thickness/cross section. The latter is sometimes
called "chord".